Bob, Those are for BMX bikes...many olde time bicycle parts makers adapted their products to cash in on the craze. I bought some nice Mafac Canti's that way and tossed the bracket!
Matt Gorski Belmont Shore, California USA
>From: Stronglight49@aol.com
>Date: 2007/05/31 Thu AM 04:38:11 CDT
>To: classicrendezvous@bikelist.org
>Subject: [CR]Unusual early Mafac cantilevers
>Interesting set of cantilever calipers with long custom "U" yokes for
>hanging from a central bolt. Still with old French blue paint. Clever! Never
>seen this treatment before. Attached wrong, but you can imagine the concept
>easy enough.
>
>eBay item: 160122788247
>
>Bob Hanson, Albuquerque, NM, USA
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